hw27b - aljabr (faa335) Hw27 Ross (89251) 1 This print-out...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: aljabr (faa335) Hw27 Ross (89251) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Pure helium gas is admitted into a tank con- taining a movable piston. The initial vol- ume, pressure, and temperature of the gas are . 047 m 3 , 197 kPa, and 421 K. If the volume is decreased to 0 . 011 m 3 and the pressure is increased to 480 kPa, find the final temperature of the gas. Correct answer: 240 . 078 K. Explanation: Given : V i = 0 . 047 m 3 , P i = 197 kPa , T i = 421 K , V f = 0 . 011 m 3 , and P f = 480 kPa . If no gas escapes from the tank, the number of moles remains constant; therefore, using the equation P V = nRT at the initial and final points gives P i V i T i = P f V f T f T f = P f V f T i P i V i = (480 kPa) ( . 011 m 3 ) (421 K) (197 kPa) (0 . 047 m 3 ) = 240 . 078 K . 002 (part 1 of 2) 10.0 points A sphere 30 cm in diameter contains an ideal gas at 1 . 2 atm and 15 C. As the sphere is heated to 119 C, gas is allowed to escape. The valve is closed and the sphere is placed in an ice-water bath. How many moles of gas escape from the sphere as it warms? Correct answer: 0 . 190402 mol. Explanation: Given : r = 30 cm 2 = 0 . 15 m , P = 1 . 2 atm , T 1 = 15 C = 288 K , T 2 = 119 C = 392 K , and R = 8 . 31451 J / K mol ....
View Full Document

This note was uploaded on 01/27/2011 for the course PHYS 251 taught by Professor Gavrine during the Spring '10 term at Purdue University-West Lafayette.

Page1 / 4

hw27b - aljabr (faa335) Hw27 Ross (89251) 1 This print-out...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online